Dynamic Spatially Selective Dephasing for Outer Volume Suppression

1Biomedical Engineering, University of Cincinnati, Cincinnati, OH, United States, 2Radiology, University of Pittsburgh, Pittsburgh, PA, United States

A novel dynamic spatially selective dephasing (DSSD)
for outer volume suppression (OVS) is introduced. This technique uses high-order
shim pulses to accomplish OVS by creating a low and high field gradient within
and outside of region of interest. The effectiveness of DSSD is investigated with
phantom and human using an 8-channel parallel transmit 7 Tesla Siemens system. Similar
suppression performance was obtained in phantom and human brain using DSSD with
a circular and an elliptical shape, respectively. The results show that OVS can be achieved by
using a high degree shim insert to generate a steep B0 gradient at periphery of
target region.

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